Science behind swelling

You step in a hole and turn your ankle, or tweak your knee. Acute injuries like these are easy to spot : first comes the pain, and then the swelling. 

• Swelling is an abnormal enlargement of a body part. It is the body's reaction to injury. 
• body always first reacts to an injury with redness, pain and heat ( inflammation ). 
• is the result of the movement of fluid and white blood cells into the area of the injury. The release of chemicals cause pain in the area of injury.
• must be put on the swelled region as ice can control inflammation by lowering heat and redness. Once the inflammation is gone, the swelling goes away.

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